I used .035" wall thickness for both fuel and brakes. It is the same thickness as vans supplied 3003, nearly twice the fatigue strength. Much nicer flares too. I am sure both would work fine. Order two extra 6' pieces just for practice as acs ships in a long tube and it cost more to ship. If you think you will need some angle for your panel or extra hinge mat now is the time to order that too.
 
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